Cranking jack for diesel engines



Feb. 22, 1949. J. H. KOBBE CRANKING JACK FOR DIESEL ENGINES Filed June '16,v 1945 f 9 Jo sphflizo be Patented Feb. 22, 1949 CRANKING J'ACK FORDIESEII'EN'GINES :Joseph Kobbe'psavannati Ill. .,.App.lication. June 16, 19.45, Serial Nd.l."5.9.9935

(ClF254-" -"1-31) 7 Claims.

" In timing valves. Qi'engines, dead center marks? onythe' flywheel must be accurately established. and in checking" the timing, as well" as other familiar serviceioperations'thedead center marks. must be. brought; to andaccurately stopped-in position. With large Diesel'engines,

such as are used'in locomotives, much. power is required to turn the flyiwheel and crank shaft. and

associated parts, and its application must be under certain and definite .control in order to stop the flywheel with the dead center marks. exactly where they should be.

" The principal obj set of this invention is to provide a simple instrument-withwhich a man can easily turn and accurately control the flywheel of aJargeenginefiGenerallyspeaking,this is accoinpliehed by means of a lever and ratchetdevice tha-t'can be operated between'afixed anchorage on the floor or foundation adjacent to the engine and selected points on the flywheel with great mechanical advantage.

A"preferred emhodiment"ofthe invention is "'shown' in the "accompanying drawings, in which look A, a jack support B, a forked lever C, and 3/ a ratchet D.

The mounting block in a form that has been found practical is 2" wide, 2" high, and 1%" thick. It is pierced through the inner section of its diagonals, or in the center, by a bore I2, and fitted at opposite sides with trunnions it, long.

The jack support is composed of two angular pieces l4 made of /2" x 1 /2" bar stock, bent substantially at right angles at i5, and provided with 1%" openings i6 and 1'! adjacent to its opposite ends. The openings l receive the trunnions l3, by means of which rotary mounting is formed for the jack support. As here shown, the trunnions is have countersunk riveted ends IS.

The forked lever C includes two arms 20 formed from X 2: 1 stock, bent at 2i and drawn down and rounded at 22 to be received snugly within a 24" length of 1" pipe 23.

The fork between thearms 29' is spanned "by a -'pin '24 with countersunk riveted'heads'iiush 'with-theputersides-oi thearms 22%; '2 oncen- .'tIS' from this-pin? iEach'armis providedwith a fulcrum pin2 E-adapted to-be receivedwithin ""the "correspondingopening "i 7 "by-means ofwhich thelever is yiulcrumed' to "the endj-of the jack supportadjacent'to the: flywheel,

Theflywh'eelis provided with a *seriesof openrings 26;, lg- 's "indi'ameter; arranged along the medial line ofthe-periph'ery. Eachbf these is somewhat :circulararm 29 provided with a series of teeth-30 The stem. 28: issufficientlyglarge in y proportion to-thwotherparts" mentioned 'when -madefof; 2''. stock; and :thenotches between the 'teeth3B"afford'ample'clearance when" 5" is the radius "at the "bottom.

The jacking 'leverismade fast to"th'eifioor or iou'ndation -lfl by"caprscrew or stud 32' passed '"through'the'bore lrTand into the floor or-foundation; as-i'ndicated in Figs. 1 and 4.

The-*assembly-is deemed obvious from the description in"connection"with the" various positions shown in the drawing. By comparison of Figs. 1 and 2, it will be seen that a man operating the forked lever C between the positions shown in Fig. 2 can readily rotate the flywheel in the direction of the arrow in suitable increments of movement to bring the dead center marks to the exact position required. The arrangement described and the leverage afforded by parts of the dimensions given permit this to be accomplished by very little effort. The rotation is all performed by a downward movement of the lever, and thus the weight of the operator does most of the work and very little actual manual strength is required to perform the rotation of the flywheel and associated parts.

It is obvious that the ratchet D may be inverted and operated to progressively turn the flywheel in the opposite direction, if desired, by merely lifting on the handle instead of forcing it down- Wardly.

Others will readily make variations in the construction and arrangement to suit particular conditions and to conform with personal preferences, but the foregoing, in connection with the drawings, is submitted as sufiicient to disclose the principle of operation and the preferred embodiment.

I claim:

1. In a device of the class described, a jack support comprising angular side pieces journalled on a mounting block adapted to be secured to a fixed foundation, a lever fulcrumed to the angular side pieces, and an arm having one end secured to a flywheel to be turned and having at its other end portion a series of spaced teeth for successive engagement with the lever.

2. In a device of the class described, a jack sup: port adapted to be made fast to a fixed foundation, a lever fulcrumed at one end on the support and having a handle at its other end, and means connecting the lever with a flywheel to be turned, said means consisting of an arm having one end secured to the flywheel and havingat its other end portion a series of spaced teeth for successive engagement with a point on the lever between the fulcrum and the handle. 3. In a device of the class described, a jack support pivoted to a fixed foundation, a lever ful- V crumed on the support, and an arm having one end secured to a flywheel to be turned and having at its other end portion a series of spaced teeth for successive engagement with the lever, whereby swinging the lever about its fulcrum causes the support to rock about its pivot and brings the lever successively into engagement with teeth on the arm to turn the flywheel.

4. In a device of the class described, a jack support pivoted to a fixed foundation, a lever fulcrumed at one end on the support and having ahandle at its other end, and an arm having one end secured to a flywheel to be turned and having at its other end portion a series of spaced teeth for successive engagement with a point on the lever between the fulcrum and the handle, whereby swinging the handle downwardly about the fulcrum causes the support to rock about its pivot and brings the lever successively into engagement with teeth on the arm to pull the arm downwardly and turn the flywheel. V

5. In a device of the class described, an arm secured to a, flywheel to be turned and having a series of teeth spaced along its length, and means for pulling the arm down comprising a support pivoted to a fixed foundation and a lever fulcrumed on the support and having an element engageable with successive teeth as the lever is swung down toward the support, said support rocking on its pivot on each rise of the lever to enable the element to clear a tooth.

6. In a device of the class described, an arm secured to a flywheel to be turned and having a series of teeth spaced along its length, and means for pulling the arm down comprising a support pivoted to a fixed foundation and a lever fulcrumed at one end on the support and having at its other end an operating handle, and an element on the lever between the fulcrum and handle engageable with successive teeth as the handle is swung down toward the support, said support 7 rocking on its pivot on each rise of the handle to enable the element to clear a tooth.

7. In a device of the class described, a support adapted to be anchored against movement in at least one direction, a, lever fulcrumed on the support having a transversely extending tooth-engaging element and a handle on the lever for moving said element with mechanical advantage, and an arm adapted to be detachably anchored at selective points along the periphery of a flywheel to be turned and having a portion thereof extending adjacent to the periphery of the flywheel with a series of teeth therein adapted to be engaged by the tooth-engaging element of the lever to rotate the flywheel with mechanical advantage.

JOSEPH H. KOBBE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 579,352 Smith Mar. 23, 1897 917,874 Johnson Apr. 13 1909 1,063,785 Eberle June 3, 1913 2,388,803 Schmidt Nov. 13, 1945 

